The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure

Marina Kounkel, Kevin Covey, Genaro Suárez, Carlos Román-Zúñiga, Jesus Hernandez, Keivan Stassun, Karl O. Jaehnig, Eric D. Feigelson, Karla Peña Ramírez, Alexandre Roman-Lopes, Nicola Da Rio, Guy S. Stringfellow, J. Serena Kim, Jura Borissova, José G. Fernández-Trincado, Adam Burgasser, D. A. García-Hernández, Olga Zamora, Kaike Pan, Christian Nitschelm

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star-forming history within the Orion Complex and identify peculiar subclusters. With this method we reconstruct the older populations in the regions that are currently largely devoid of molecular gas, such as Orion C (which includes the σ Ori cluster) and Orion D (the population that traces Ori OB1a, OB1b, and Orion X). We report on the distances, kinematics, and ages of the groups within the Complex. The Orion D group is in the process of expanding. On the other hand, Orion B is still in the process of contraction. In λ Ori the proper motions are consistent with a radial expansion due to an explosion from a supernova; the traceback age from the expansion exceeds the age of the youngest stars formed near the outer edges of the region, and their formation would have been triggered when they were halfway from the cluster center to their current positions. We also present a comparison between the parallax and proper-motion solutions obtained by Gaia DR2 and those obtained toward star-forming regions by the Very Long Baseline Array.

Original languageEnglish (US)
Article number84
JournalAstronomical Journal
Volume156
Issue number3
DOIs
StatePublished - Sep 2018

Fingerprint

stars
proper motion
contraction
explosion
Very Long Baseline Array (VLBA)
kinematics
expansion
parallax
molecular gases
history
supernovae
explosions
gas
histories
young
comparison
method
analysis

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kounkel, M., Covey, K., Suárez, G., Román-Zúñiga, C., Hernandez, J., Stassun, K., ... Nitschelm, C. (2018). The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure. Astronomical Journal, 156(3), [84]. https://doi.org/10.3847/1538-3881/aad1f1
Kounkel, Marina ; Covey, Kevin ; Suárez, Genaro ; Román-Zúñiga, Carlos ; Hernandez, Jesus ; Stassun, Keivan ; Jaehnig, Karl O. ; Feigelson, Eric D. ; Ramírez, Karla Peña ; Roman-Lopes, Alexandre ; Rio, Nicola Da ; Stringfellow, Guy S. ; Kim, J. Serena ; Borissova, Jura ; Fernández-Trincado, José G. ; Burgasser, Adam ; García-Hernández, D. A. ; Zamora, Olga ; Pan, Kaike ; Nitschelm, Christian. / The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure. In: Astronomical Journal. 2018 ; Vol. 156, No. 3.
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abstract = "We present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star-forming history within the Orion Complex and identify peculiar subclusters. With this method we reconstruct the older populations in the regions that are currently largely devoid of molecular gas, such as Orion C (which includes the σ Ori cluster) and Orion D (the population that traces Ori OB1a, OB1b, and Orion X). We report on the distances, kinematics, and ages of the groups within the Complex. The Orion D group is in the process of expanding. On the other hand, Orion B is still in the process of contraction. In λ Ori the proper motions are consistent with a radial expansion due to an explosion from a supernova; the traceback age from the expansion exceeds the age of the youngest stars formed near the outer edges of the region, and their formation would have been triggered when they were halfway from the cluster center to their current positions. We also present a comparison between the parallax and proper-motion solutions obtained by Gaia DR2 and those obtained toward star-forming regions by the Very Long Baseline Array.",
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Kounkel, M, Covey, K, Suárez, G, Román-Zúñiga, C, Hernandez, J, Stassun, K, Jaehnig, KO, Feigelson, ED, Ramírez, KP, Roman-Lopes, A, Rio, ND, Stringfellow, GS, Kim, JS, Borissova, J, Fernández-Trincado, JG, Burgasser, A, García-Hernández, DA, Zamora, O, Pan, K & Nitschelm, C 2018, 'The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure', Astronomical Journal, vol. 156, no. 3, 84. https://doi.org/10.3847/1538-3881/aad1f1

The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure. / Kounkel, Marina; Covey, Kevin; Suárez, Genaro; Román-Zúñiga, Carlos; Hernandez, Jesus; Stassun, Keivan; Jaehnig, Karl O.; Feigelson, Eric D.; Ramírez, Karla Peña; Roman-Lopes, Alexandre; Rio, Nicola Da; Stringfellow, Guy S.; Kim, J. Serena; Borissova, Jura; Fernández-Trincado, José G.; Burgasser, Adam; García-Hernández, D. A.; Zamora, Olga; Pan, Kaike; Nitschelm, Christian.

In: Astronomical Journal, Vol. 156, No. 3, 84, 09.2018.

Research output: Contribution to journalArticle

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T1 - The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure

AU - Kounkel, Marina

AU - Covey, Kevin

AU - Suárez, Genaro

AU - Román-Zúñiga, Carlos

AU - Hernandez, Jesus

AU - Stassun, Keivan

AU - Jaehnig, Karl O.

AU - Feigelson, Eric D.

AU - Ramírez, Karla Peña

AU - Roman-Lopes, Alexandre

AU - Rio, Nicola Da

AU - Stringfellow, Guy S.

AU - Kim, J. Serena

AU - Borissova, Jura

AU - Fernández-Trincado, José G.

AU - Burgasser, Adam

AU - García-Hernández, D. A.

AU - Zamora, Olga

AU - Pan, Kaike

AU - Nitschelm, Christian

PY - 2018/9

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N2 - We present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star-forming history within the Orion Complex and identify peculiar subclusters. With this method we reconstruct the older populations in the regions that are currently largely devoid of molecular gas, such as Orion C (which includes the σ Ori cluster) and Orion D (the population that traces Ori OB1a, OB1b, and Orion X). We report on the distances, kinematics, and ages of the groups within the Complex. The Orion D group is in the process of expanding. On the other hand, Orion B is still in the process of contraction. In λ Ori the proper motions are consistent with a radial expansion due to an explosion from a supernova; the traceback age from the expansion exceeds the age of the youngest stars formed near the outer edges of the region, and their formation would have been triggered when they were halfway from the cluster center to their current positions. We also present a comparison between the parallax and proper-motion solutions obtained by Gaia DR2 and those obtained toward star-forming regions by the Very Long Baseline Array.

AB - We present an analysis of spectroscopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures toward the Orion Complex. By applying a hierarchical clustering algorithm to the six-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star-forming history within the Orion Complex and identify peculiar subclusters. With this method we reconstruct the older populations in the regions that are currently largely devoid of molecular gas, such as Orion C (which includes the σ Ori cluster) and Orion D (the population that traces Ori OB1a, OB1b, and Orion X). We report on the distances, kinematics, and ages of the groups within the Complex. The Orion D group is in the process of expanding. On the other hand, Orion B is still in the process of contraction. In λ Ori the proper motions are consistent with a radial expansion due to an explosion from a supernova; the traceback age from the expansion exceeds the age of the youngest stars formed near the outer edges of the region, and their formation would have been triggered when they were halfway from the cluster center to their current positions. We also present a comparison between the parallax and proper-motion solutions obtained by Gaia DR2 and those obtained toward star-forming regions by the Very Long Baseline Array.

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Kounkel M, Covey K, Suárez G, Román-Zúñiga C, Hernandez J, Stassun K et al. The APOGEE-2 Survey of the Orion Star-forming Complex. II. Six-dimensional Structure. Astronomical Journal. 2018 Sep;156(3). 84. https://doi.org/10.3847/1538-3881/aad1f1